<script src="prototype.js"></script>
<script src="jquery.js"></script>
<script>
jQuery.noConflict();
// Use jQuery via jQuery(…)
jQuery(document).ready(function(){
jQuery(”div”).hide();
});
// Use Prototype with $(…), etc.
$('someid').style.display = ‘none';
</script>

var $j = jQuery.noConflict();
$j(document).ready(function(){
$j(”div”).hide();
});